“The trustees have declined several of her requests for funds, including for instance, a request for funds to buy a new wheelchair,” the lawsuit claims, and names the family’s longtime attorney, Charles Gibbs, as a trustee.

The heiress’ alcoholic husband started the Smithers addiction-treatment center, which drew famed clients like Darryl Strawberry and Truman Capote.

R. Brinkley Smithers, who died in 1994 after donating almost $30 million to addressing alcoholism, got his money from his Canadian-born grandfather, a leading banker.

Adele Smithers now wants to transfer authority over her affairs away from Gibbs and to a new lawyer.

But Gibbs won’t hand over the files because he believes the elderly woman is not mentally fit to make that decision, the court papers claim.